The 20-year-old's strapless Dolce & Gabbana gown didn't have a thigh-high split, and Grande accessorized with a Jimmy Choo clutch and Tacori jewels rather than arm-length gloves, but her flowing tresses were more than a little similar to Jessica's Veronica Lake-esque 'do.

After paying tribute to salsa queen Celia Cruz and tearing it up "On the Floor" at the AMAs Sunday night, Jennifer Lopez continued to party well into the night.

Lopez attended an after party at Chateau Marmont hosted by the owners of DSquared.

The American Idol judge, whose Kohls campaign (#getjenniferthere) and knockout performance made her the No. 1 trending topic on Twitter, wore a black DSquared dress designed by the fashion house's twin brothers, Dean and Dan.

But as anyone watching the show will tell you, the actual awards ended up taking a backseat to the night's many performers, who incited Twitter trends and plenty of head-scratching as the evening wore on.

In case you were watching The Walking Dead or Sunday Night Football, here's what had us asking, "What just happened?"

No surprise here: Taylor Swift took home the night's top honor, artist of the year, after Cyrus hit the stage to perform "Wrecking Ball."

"I'm really out of breath. I was really going hard with the 'Wrecking Ball' thing," Swift, who also collected wins for favorite country album, favorite female pop/rock artist and favorite country female artist, told the audience.

Sunday night's American Music Awards will basically be the ultimate concert as Miley Cyrus, Lady Gaga and more prepare to hit the stage.

But before you sing along, get ready for the big show with the Coca-Cola Red Carpet LIVE! Digital Pre-Show, streaming below via Yahoo starting at 5 p.m.

Along with interviews from nominees, Jesse McCartney, the Jabbawockeez, Fifth Harmony, Aloe Blacc and Kurt Hugo Schneider are due to perform during the pre-show as Lance Bass, Jordin Sparks, Zendaya and fashion blogger Aimee Song play host. Watch now!